API Cost Estimator
Estimate API bills from request volumes and price-per-million — OpenAI and Stripe presets included. Forecast a 1M-request month before committing — local math, free, no signup.
How to Use the API Cost Estimator
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Frequently Asked Questions
How do I estimate 1M calls?
Enter monthly requests with price-per-million: 1M requests at $0.50/million costs $0.50 total, split per user by the user count. Try the OpenAI, Stripe, or Startup presets, then model growth scenarios.
Do tiers and free quotas count?
No — the tool has no tier or free-quota inputs; volume times price-per-million is the whole math. Enter a blended rate yourself for tiered plans; any plan limits are shown in the tool.
What about caching savings?
Estimate hit rate separately: 40% cache hits cut billable calls nearly in half. Size Redis costs against the API savings before assuming wins.
Do cost figures leave the browser?
No — math runs locally in your browser. Figures never leave your device.
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Last updated October 2026